I'll admit, I use layer crumbles for cat litter so that could be a legitimate question from my husband . The dust from the clay kind makes me sick, and crumbles clump and control smell just as good as the alternative grain-based litters except instead of paying $30 for a 40 lb bag at a big pet...
Calcium carbonate (oyster shell) isn't very water soluble, though higher acidity will break it down if you have soft/low pH water. I used to use it to harden the water in my fishtanks, since harder water keeps a more stable pH, and it always balanced out around pH 7.5-8.0 no matter how much I...